/**
  ******************************************************************************
  * @file    TIM4/TIM4_TimeBase/main.c
  * @author  MCD Application Team
  * @version V1.5.2
  * @date    30-September-2014
  * @brief   Main program body
  ******************************************************************************
  * @attention
  *
  * <h2><center>&copy; COPYRIGHT 2014 STMicroelectronics</center></h2>
  *
  * Licensed under MCD-ST Liberty SW License Agreement V2, (the "License");
  * You may not use this file except in compliance with the License.
  * You may obtain a copy of the License at:
  *
  *        http://www.st.com/software_license_agreement_liberty_v2
  *
  * Unless required by applicable law or agreed to in writing, software
  * distributed under the License is distributed on an "AS IS" BASIS,
  * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
  * See the License for the specific language governing permissions and
  * limitations under the License.
  *
  ******************************************************************************
  */

/* Includes ------------------------------------------------------------------*/
#include "stm8l15x.h"
#include "stm8_eval.h"

/** @addtogroup STM8L15x_StdPeriph_Examples
  * @{
  */

/** @addtogroup TIM4_TimeBase
  * @{
  */

/* Private typedef -----------------------------------------------------------*/
/* Private define ------------------------------------------------------------*/
#define TIM4_PERIOD       124

/* Private macro -------------------------------------------------------------*/
/* Private variables ---------------------------------------------------------*/
__IO uint32_t TimingDelay;

/* Private function prototypes -----------------------------------------------*/
static void CLK_Config(void);
static void TIM4_Config(void);
void Delay(__IO uint32_t nTime);
void TimingDelay_Decrement(void);
/* Private functions ---------------------------------------------------------*/

/**
  * @brief  Main program.
  * @param  None
  * @retval None
  */
void main(void)
{
    /* CLK configuration -------------------------------------------*/
    CLK_Config();

    /* Initialize Leds mounted on STM8L1526-EVAL board */
    STM_EVAL_LEDInit(LED1);
    STM_EVAL_LEDInit(LED2);
    STM_EVAL_LEDInit(LED3);
    STM_EVAL_LEDInit(LED4);

    /* Turn on LED1 and LED3 */
    STM_EVAL_LEDOn(LED1);
    STM_EVAL_LEDOn(LED3);

    /* TIM4 configuration -------------------------------------------*/
    TIM4_Config();

    while (1)
    {
        /* Toggle LED2 and LED4 */
        STM_EVAL_LEDToggle(LED2);
        STM_EVAL_LEDToggle(LED4);

        /* Insert 50 ms delay */
        Delay(50);

        /* Toggle LED1 and LED3 */
        STM_EVAL_LEDToggle(LED1);
        STM_EVAL_LEDToggle(LED3);

        /* Insert 100 ms delay */
        Delay(100);
    }
}

/**
  * @brief  Configure peripherals Clock
  * @param  None
  * @retval None
  */
static void CLK_Config(void)
{
    /* High speed internal clock prescaler: 1 */
    CLK_SYSCLKDivConfig(CLK_SYSCLKDiv_1);

    /* Select HSE as system clock source */
    CLK_SYSCLKSourceSwitchCmd(ENABLE);
    CLK_SYSCLKSourceConfig(CLK_SYSCLKSource_HSE);

    while (CLK_GetSYSCLKSource() != CLK_SYSCLKSource_HSE)
    {}

    /* Enable TIM4 CLK */
    CLK_PeripheralClockConfig(CLK_Peripheral_TIM4, ENABLE);
}

/**
  * @brief  Configure TIM4 peripheral
  * @param  None
  * @retval None
  */
static void TIM4_Config(void)
{
    /* TIM4 configuration:
     - TIM4CLK is set to 16 MHz, the TIM4 Prescaler is equal to 128 so the TIM1 counter
     clock used is 16 MHz / 128 = 125 000 Hz
    - With 125 000 Hz we can generate time base:
        max time base is 2.048 ms if TIM4_PERIOD = 255 --> (255 + 1) / 125000 = 2.048 ms
        min time base is 0.016 ms if TIM4_PERIOD = 1   --> (  1 + 1) / 125000 = 0.016 ms
    - In this example we need to generate a time base equal to 1 ms
     so TIM4_PERIOD = (0.001 * 125000 - 1) = 124 */

    /* Time base configuration */
    TIM4_TimeBaseInit(TIM4_Prescaler_128, TIM4_PERIOD);
    /* Clear TIM4 update flag */
    TIM4_ClearFlag(TIM4_FLAG_Update);
    /* Enable update interrupt */
    TIM4_ITConfig(TIM4_IT_Update, ENABLE);
    /* enable interrupts */
    enableInterrupts();

    /* Enable TIM4 */
    TIM4_Cmd(ENABLE);
}
/**
  * @brief  Inserts a delay time.
  * @param  nTime: specifies the delay time length, in milliseconds.
  * @retval None
  */
void Delay(__IO uint32_t nTime)
{
    TimingDelay = nTime;

    while (TimingDelay != 0);
}

/**
  * @brief  Decrements the TimingDelay variable.
  * @param  None
  * @retval None
  */
void TimingDelay_Decrement(void)
{
    if (TimingDelay != 0x00)
    {
        TimingDelay--;
    }
}

#ifdef  USE_FULL_ASSERT

/**
  * @brief  Reports the name of the source file and the source line number
  *   where the assert_param error has occurred.
  * @param  file: pointer to the source file name
  * @param  line: assert_param error line source number
  * @retval None
  */
void assert_failed(uint8_t *file, uint32_t line)
{
    /* User can add his own implementation to report the file name and line number,
       ex: printf("Wrong parameters value: file %s on line %d\r\n", file, line) */

    /* Infinite loop */
    while (1)
    {}
}
#endif

/**
  * @}
  */

/**
  * @}
  */

/************************ (C) COPYRIGHT STMicroelectronics *****END OF FILE****/
